Remove unused placeholder files

app/assets/javascripts/repo/helpers/repo_helper.js

@@ -82,11 +82,6 @@ const RepoHelper = {
     .catch(RepoHelper.loadingError);
   },
 
-  toggleFakeTab(loading, file) {
-    if (loading) return Store.addPlaceholderFile();
-    return Store.removeFromOpenedFiles(file);
-  },
-
   // when you open a directory you need to put the directory files under
   // the directory... This will merge the list of the current directory and the new list.
   getNewMergedList(inDirectory, currentList, newList) {

app/assets/javascripts/repo/stores/repo_store.js

@@ -180,24 +180,6 @@ const RepoStore = {
     }
   },
 
-  addPlaceholderFile() {
-    const randomURL = Helper.Time.now();
-    const newFakeFile = {
-      active: false,
-      binary: true,
-      type: 'blob',
-      loading: true,
-      mime_type: 'loading',
-      name: 'loading',
-      url: randomURL,
-      fake: true,
-    };
-
-    RepoStore.openedFiles.push(newFakeFile);
-
-    return newFakeFile;
-  },
-
   addToOpenedFiles(file) {
     const openFile = file;